URGENT: At least 15 people have been killed and up to 50 injured after a mass shooting at a showing of “The Dark Knight Rises” at a suburban Denver movie theater, police say.

The suspect, believed to be the lone gunman, is in police custody. KUSA reports that the suspect kicked down an emergency door at the theater, threw in some type of a smoke bomb and when moviegoers started to run, he began shooting.

Police, ambulances and emergency crews swarmed on the scene after frantic calls started flooding in to authorities, officials said.

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James Cameron, who was in an adjacent theater, said he hear commotion and screaming. People seated around him began coughing and having difficulty breathing.

UPDATE III (5:17 AM EDT): Police Chief Oates is now speaking at a press conference: “Right now we only know of one gunman, and we have no evidence of additional shooters.” He said that police remain “concerned” about that, although they have no evidence to support this.

Updated at 5:54 a.m. ET: At least 14 people were killed early Friday when at least one gunman opened fire at a midnight screening of the summer blockbuster “The Dark Knight Rises” near Denver, authorities and witnesses said.

Aurora police chief Dan Oates told reporters that 10 people died at the scene of the shooting and four others died after being taken to local hospitals. At least 50 other people were injured, Oates said.

One suspect was in custody, police said.

The incident occurred in the Century 16 Movie Theaters at the Aurora Town Center, police told NBC News. Aurora is a suburb less than 10 miles east of downtown Denver.